Cf. SCR, Instruction Eucharisticum mysterium (=EM) (May 25, 1967), n. 26. AAS 59 (1967): 558. N.B.: In monastaries of nuns, every effort should be made to celebrate the Easter Triduum with the greatest possible ceremnoy, but within the monastary church.

Cf. General Instruction of the Liturgy of the Hours (=GILOTH), n. 210.

Cf. Roman Missal, "Holy Saturday."

Maxima redemptionis nostrae mysteria, AAS 47 (1955): 843.

Ex 12:42.

St. Augustine, Sermo 219, PL 38: 1088.

Cf. CE, n. 332.

Ibid.; Cf. Roman Missal, "The Easter Vigil," n. 3.

Cf. EM, n. 28. AAS 59 (1967): 556-557.

Roman Missal, "The Easter Vigil," n. 19, Easter Proclamation.

SC, n. 6; Cf. Rom 6:3-6; Eph 2:5-6; Col 2:12-13; 2 Tm 2:11-12.

"We keep vigil on that night because the Lord rose from the dead; that life . . . where there is no longer the sleep of death, began for us in his flesh; being thus risen, death will be no more nor have dominion. . . . If we have kept vigil for the risen one, he will see that we shall reign with him for ever." St. Augustine, Sermo Guelferbytan, 5, 4, PLS 2: 552.

It is possible to combine the celebration of first Vespers with the celebration of Mass as provided in the General Instruction of the Liturgy of the Hours, n. 96.
In order to throw into greater relief the mystery of this day, it is possible to have several readings from Holy Scripture, as proposed in the Lectionary.
In this case, after the collect, the reader goes to the ambo to proclaim the reading.
The psalmist or cantor sings the psalm, to which the people respond with the refrain.
Then, all stand and the priest says, "Let us pray"; after a short pause, he says the prayer corresponding to the reading (e.g., one of the collects for the ferial days of the Seventh Week of Easter).